Well, since the website says "Manufactured by Ritek", I'm guessing these are RICOHJPNW11 discs.The only way to be certain would be to call the retailer and inquire on the exact MID code.RICOHJPNW11 discs should work flawlessly with the stock NEC firmwares.Any HP based firmware (including Herries' patched firmwares) will have higher than average PI/PO errors on approximately 1 out of every 5 burns on a DVD+RW disc...